Electric fire and burglar alarm.



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PATENTED MAY 31, 1904.

W. C. BARGER. ELECTRIC FIRE AND BURGLAR ALARM.

N0 MODEL.

7 APPLICATION FILED MAR-v31, 1904.

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UN TED STATES Patented May 31, 1904.

PATENT I OFFICE.

'WILLIAM CALVIN BAR GER, OF MAMMOTH, WEST VIRGINIA.'

ELECTRIC FIRE AND BURGLAR ALARM.

SPECIFICATION formingpart of Letters Patent No. 761,572, dated May 31, 1904.

Application filed March 31,1504.

To add whom/it may concern:

' Be it known that I, WILLIAM CALVIN BAR- GER, a citizen of the United States, residing at Mammoth, in the county of Kanawha and State of West Virginia, have invented anew and useful Improvement in Electric Fire and Burglar Alarms,of which the following is a specification.

- My invention is in the nature of an improved electric fire and burglar'alarm. It belongs to that class of alarms in which a cord maina room, showing my alarm applied to a window and a door. Fig. 2 is a front view, and Fig. 2 is a sectional view, of the cord-tightener forming a part of my alarm mechanism. Fig. 3 is a frontview, and Fig. 4 a sectional view on line 4 4: of Fig. 3, showing the electrical alarm mechanism on a larger scale; and Fig. 5 is a diagram view of a series of rooms equipped with my alarm.

Referring to Figs. 3 and 4, A represents a dry battery, B is an electric bell, and C is an upright spring-bar rigidly connected to the framework at its lower end and extending up to the top of the alarm apparatus and there connected by a spiral spring F with the back board of the framework. The upper end of the spring-bar C is guided in a yoke E and has one or more screw-eyes 0, to which cords may be attached, and also has projecting toward the back board a set-screw and immediately behind this screw in the back board is a push-button'D, connected to a spring dand adapted to force the spring d against another one, 03', behind it. These two springs are I terminal contacts of two circuit-wires a a of which 01/ runs straight to one pole of the battery, while (0 runs to the bell and then through the bell-magnets connects electrically with the wire a, leading from the bell to the other pole Serial No 200.003. (No model.)

is forced in to bring springs 61 d into contact with each other the battery-circuit will be.

completed through the bell-magnets and the bell will ring. The spring-bar C is elastic throughout its length, and its resilience is further supplemented by the spiral spring F at its top. This spring-bar is designed to be normally pulled out and held under a strong tension by one or more cords connected with the screw-eye c, which cords run to various parts of the building to be protected. So long as this spring-bar is pulled out and held under this tension its screw 6 is away from the pushbutton D; but if the cord be slackened by being burned in two or by the opening of a door or window then the spring-bar C approaches the push-button and the screw 0 of the springbar, by pressing upon the push-button, sounds the alarm.

In setting up my alarm (see Fig. 1) the alarn mechanism isput, preferably, in some elevated out-of-the-way place, and the screw-eye of the spring-bar C is connected to the cord 00. This cord in one application of the invention is carried over pulley 1), down to the lower sash of a window and then up again to and over the pulley 6. Thence it passes to pulley and around pulley If on the door and then back to pulley b and thence to a stationary hook y and thence to a cord-tightener G..

This cord-tightener is constructed, as hereinafter described, to take up any amount of slack and hold the whole length of cord 00 under a strong tension that pulls the spring-bar C back from the push-button. If now the cord w should be slackened by the raising of the window, the opening of the door, or the burning the cord, it will be seenthat the alarm is sounded, as hereinbefore described.

'The cord-tightener G is an important feature of my alarm and is shown in detail-in Figs. 2-and 2. It consists in a main body portion having a recessed and serrated side in which 'fits a movable clamp-section G, adjustably held by set-screw 9. At one end of the body portion G there is a hole g, through which-the cord at is passed, and thence it is extended between and clamped by the serrated faces of' G and G. Thence it passes through a hole 9 then extends to the anchorage-point and comes back again to the tightener and passing through a hole in the end 9 and is connected to a helical spring g which is disposed in a slot formed at this end of the cord-tightener and is protected thereby. The tensionof the spring g makes the cord-tightener to take up any slack that may get into the cord from changes of weather or other causes, and by loosening the clamp-screw and sliding the cord-tightener along the cord m the length of cord may be adjusted to the particular application or size of room.

When my invention is applied to a series of rooms, as in a hotel, the cord is run through all of the rooms, as seen in Fig. 5, and is maintained under a strong tension by my cordtighteners, and a separate alarm mechanism, such as is shown in Figs. 3 and 4, is placed in each room and connected by branch cords x with cord-tighteners to the main cord w, so that in case the main cord is slaekened by a fire in any room the alarms in all of the other rooms will be set ofi.

In making use of my invention I would have it understood that I may apply it to the exterior of a building as Well as the interior.

Having thus described my invention, what 1 claim as new, and desire to secure by Letters Patent, is

1. An alarm mechanism, comprising a source of electric current, an electric bell, a pushbutton having contacts forming terminals of an electric circuit through the bell and a spring-bar having connections for a cord, and a screw connected to the spring-bar and arranged in line with the push-button to depress it when tension on the spring-bar is released substantially as described.

2. An alarm mechanism, comprising a source of electric current, an electric bell, a pushbutton having contacts forming terminals of an electric circuit through the bell, a springbar rigidly connected to the framework at one end, a yoke-shaped guide embracing the other end of the spring-bar, a push-button arranged behind the spring-bar, and having contacts forming terminals of the electric circuit, a supplemental spring connected to the free end of the spring-bar, and a screw attached to the spring-bar and adapted to depress the pushbutton when tension on the spring-bar is released.

- 3. The combination with an alarm mechanism having a spring-bar; of a cord holding said spring-bar under tension, said cord being extended throughout the rooms to be protected, and a cord-tightener consisting of two separable clamp-sections arranged adj ustably on the cord to take up the slack and maintain tension on the cord substantially as shown and described.

4. The combination with an alarm mechanism; of a, cord for holding the alarm mechanism under tension, said cord being extended throughout the rooms to beprotected, and a cord-tightener having both an adjustable takeup clamp and a tension-spring for taking up slack, the cord being attached at one end to the tension-spring and adjustably secured between the elamps substantially as described.

5. The combination of a tension-cord extending through a series of rooms and maintained taut; of a series of supplemental tension-cords in each room connected to the main cord and provided with a cord-tightener and alarm mechanism for each room substantially as described.

WILLIAM CALVIN BARGER. Witnesses:

S. P. KENNEDY, C. H. MA'rios. 

